Ecole Normale Supérieure de Lyon

Our research group explores the physics of information in quantum devices, which we design, realize and measure. These objects can be viewed as quantum machines processing information. In contrast with ordinary devices, in which quantum mechanics enters only at the level of individual electrons, the degrees of freedom of these machines at the signal level behave according to the laws of quantum mechanics.
Topics of our current interest include amplification of quantum signals, manifestations of zero point fluctuations in circuits, quantum feedback and trajectory, thermodynamics of quantum information, experimental tests of deviations to quantum theory, microwave quantum optics and quantum measurement.
The Quantum Circuit group was funded in 2016 when Benjamin Huard became professor in Ecole Normale Supérieure of Lyon, therefore leaving the Quantum Electronics Group he cofunded in 2008 with Michel Devoret at Ecole Normale Supérieure of Paris.

We are looking for post-docs! Contact if interested.

Our group is a member of the Laboratoire International Associé Laboratoire sur les Circuits et Matériaux Quantiques (LIA LCMQ), of the Groupement de Recherche du CNRS Physique Mésoscopique (GDR 2426) and of the Groupement de Recherche du CNRS Information Quantique (GDR 3322).



Benjamin Huard

Benjamin Huard graduated from the Ecole Normale Supérieure of Paris in 2003 and did his PhD studies in the Quantronics group at CEA Saclay (France) with Hugues Pothier. There, he performed experiments aiming at investigating the behavior of electrons in mesoscopic metallic and superconducting conductors. In 2006, he joined the Goldhaber-Gordon group at Stanford University (USA) as a post-doc fellow, and observed the Klein tunneling of electrons in graphene for the first time. In 2008, as a CNRS researcher, he cofounded the Quantum Electronics group at Ecole Normale Supérieure (Paris, France) with Michel Devoret. He received the Saint-Gobain award of the French Physics Society in 2006 and was appointed associate researcher at Ecole Normale Supérieure Paris in 2014. He is a professor at Ecole Normale Supérieure de Lyon since 2016. Publication list


Nathanaël Cottet

Nathanaël Cottet

PhD student since 2015

He is working on the realization of thermal machines in the quantum regime based on superconducting circuits. He has worked on new measurement schemes using fluxonium qubits in the group of Vladimir Manucharyan at JQI in Maryland in 2016-2017. He has now been in Lyon since 2017.

Quentin Ficheux

Quentin Ficheux

PhD student since 2015

He is working on the back action of quantum measurements in circuit QED. After having starting his PhD work in Paris, he pursued his research work in Lyon since 2017.

Sébastien Jezouin

Théau Peronnin

PhD student since 2016

He is developing quantum information protocols using quantum networks of superconducting circuits. After having starting his PhD work in Paris, he pursued his research work in Lyon since 2017.

Jeremy Stevens

Jeremy Stevens

PhD student since 2017

In particular, he is developping microwave resonators out of various superconducting materials.

Antoine Essig

Antoine Essig

En thèse depuis 2018

He performs experiments on the quantum backaction of fluorescence measurement and on the topological protection of new physical observables..


We closely collaborate with the Quantic team which was funded in 2015, and of which we were officially members before moving to Lyon. Quantic is hosted in Paris by Inria, Mines ParisTech and Ecole Normale Supérieure of Paris. The permanent members are listed here.


Danijela Marković

Danijela was a PhD student from 2014 to 2017.

Zaki Leghtas

Zaki Leghtas worked in the Quantum Electronics group from 2015 to 2017 as a researcher of Mines ParisTech. He is now part of the Hybrid Quantum Circuits team at ENS Paris.

Raphaël Lescanne

Raphaël realized the first part of his PhD work between 2016 and 2017 in the group and keeps working with his advisor Zaki Leghtas at ENS Paris.

Sébastien Jezouin

Sébastien was a post-doc for 2 and a half years in 2015-2017. Now a postdoctoral fellow at Institut Quantique - Université de Sherbrooke in Canada.

Landry Bretheau

Landry was a post-doc for 2 years in 2013-2015. Now associate professor at Ecole Polytechnique.

Vladimir Manucharyan

Vlad was a visitor for a few months in 2013. Now professor at the Joint Quantum Institute - University of Maryland.

Jean-Damien Pillet

Jean-Damien was a post-doc for 1 year in 2012. Now associate professor at Ecole Polytechnique.

François Mallet

Francois Mallet worked in the Quantum Electronics group from 2011 to 2016 as an associate professor at Université Pierre et Marie Curie. Now associate professor in the Hybrid Quantum Circuits team at ENS Paris.

Philippe Campagne

Philippe was a PhD student from 2011 to 2015. Now a postdoctoral fellow in the Qulab group at Yale University.

Emmanuel Flurin

Emmanuel was a PhD student from 2011 to 2014. Now a postdoctoral fellow in the Optomechanics and Quantum measurements group at ENS Paris.

Nicolas Roch

Nicolas was a post-doc for 3 years from 2010 to 2012. Now CNRS researcher at Institut Néel in Grenoble, France.

François Nguyen

François was a post-doc for 1 year in 2008-2009.

Michel Devoret

Michel H. Devoret, a professor at Yale University since 2002, was appointed to the Chair of Mesoscopic Physics at the College de France in Paris, where he lectured yearly from 2007 to 2012. He co-funded the Quantum electronics group in 2008 with Benjamin Huard and worked in the group for the whole duration of his chair. Website

Former interns

Marco Fellous Asiani (2017)

Charles Babin (2017)

Théau Peronnin (2015)

Pierre Heidmann (2014)

Cyprien Poirier (2014)

Yael Gagnepain (2013)

Jules Denier (2012)

Lauriane Contamin (2012)

Nathanael Cottet (2012)

Lola El Sahmarany (2010)

Florent Baboux (2010)

Elisabeth Bonnefoy (2010)



Dynamics of an off-resonantly pumped superconducting qubit in a cavity R. Lescanne, L. Verney, Q. Ficheux, M. H. Devoret, B. Huard, M. Mirrahimi and Z. Leghtas, arXiv:1805.05198

Maxwell's demon in superconducting circuits N. Cottet and B. Huard, arXiv:1805.01224 to appear as a chapter of the book 'Thermodynamics in the quantum regime - Recent Progress and Outlook' edited by Felix Binder, Luis Correa, Christian Gogolin, Janet Anders and Gerardo Adesso

Demonstration of an effective ultrastrong coupling between two oscillators D. Marković, S. Jezouin, Q. Ficheux, S. Fedortchenko, S. Felicetti, T. Coudreau, P. Milman, Z. Leghtas and B. Huard, arXiv:1804.08705


Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing Q. Ficheux, S. Jezouin, Z. Leghtas and B. Huard (2018), Nat. Comm. 9, 1926 (supplementary information). Click on the video to access all experimental videos.

Observing a quantum Maxwell demon at work N. Cottet, S. Jezouin, L. Bretheau, P. Campagne-Ibarcq, Q. Ficheux, J. Anders, A. Auffèves, R. Azouit, P. Rouchon and B. Huard (2017), PNAS 114, 7561 (open access PDF)

Extracting work from quantum measurement in Maxwell demon engines C. Elouard, D. Herrera-Marti, B. Huard, A. Auffèves (2017), Phys. Rev. Lett. 118, 260603 (open access PDF)

Quantum simulation of ultrastrongly coupled bosonic modes using superconducting circuits S. Fedortchenko, S. Felicetti, D. Marković, S. Jezouin, A. Keller, T. Coudreau, B. Huard, and P. Milman (2017), Phys. Rev. A 95, 042313 (open access PDF)

Using Spontaneous Emission of a Qubit as a Resource for Feedback Control P. Campagne-Ibarcq, S. Jezouin, N. Cottet, P. Six, L. Bretheau, F. Mallet, A. Sarlette, P. Rouchon, and B. Huard (2016), Phys. Rev. Lett. 117, 060502 (open access PDF, supplementary information)

Observing quantum state diffusion by heterodyne detection of fluorescence P. Campagne-Ibarcq, P. Six, L. Bretheau, A. Sarlette, M. Mirrahimi, P. Rouchon, and B. Huard (2016), Phys. Rev. X 6, 011002 (open access PDF, supplementary information)

Anatomy of Fluorescence: Quantum trajectory statistics from continuously measuring spontaneous emission A.N. Jordan, A. Chantasri, P. Rouchon and B. Huard (2016), Quantum Stud.: Math. Found. 3: 237. (open access PDF)

Quantum state tomography with measurement imperfections and decoherence P. Six, P. Campagne-Ibarcq, I. Dotsenko, A. Sarlette, B. Huard, and P. Rouchon (2016), Phys. Rev. A 93, 012109 (open access PDF)

Parameter estimation from measurements along quantum trajectories P. Six, P. Campagne-Ibarcq, L. Bretheau, B. Huard, and P. Rouchon (2015), 54th IEEE Conference on Decision and Control

Les microprocesseurs du futur B. Huard (2015), La Recherche 501, 62

Optimal design for the Josephson mixer J.-D. Pillet, E. Flurin, F. Mallet, and B. Huard (2015), Applied Physics Letters 106, 222603 (open access, supplementary information)

Quantum dynamics of an electromagnetic mode that cannot contain N photons L. Bretheau, P. Campagne-Ibarcq, E. Flurin, F. Mallet, and B. Huard (2015), Science, 348, 776 (open access PDF, supplementary information, featured in Arstechnica and Phys.org)

Superconducting quantum node for entanglement and storage of microwave radiation E. Flurin, N. Roch, J.-D. Pillet, F. Mallet and B. Huard (2015), Phys. Rev. Lett. 114, 090503 (open access PDF, supplementary information)

Observing interferences between past and future quantum states in resonance fluorescence P. Campagne-Ibarcq, L. Bretheau, E. Flurin, A. Auffèves, F. Mallet and B. Huard (2014), Phys. Rev. Lett. 112, 180402 (open access PDF, supplementary information)

Stabilizing the trajectory of a superconducting qubit by projective measurement feedback P. Campagne-Ibarcq, E. Flurin, N. Roch, D. Darson, P. Morfin, M. Mirrahimi, M. H. Devoret, F. Mallet and B. Huard (2013), Phys. Rev. X 3, 021008 (open access PDF, supplementary information)

Widely tunable, non-degenerate three-wave mixing microwave device operating near the quantum limitN. Roch, E. Flurin, F. Nguyen, P. Morfin, P. Campagne-Ibarcq, M. H. Devoret and B. Huard (2012), Phys. Rev. Lett. 108, 147701 (open access PDF, supplementary information)

Generating Entangled Microwave Radiation Over Two Transmission Lines E. Flurin, N. Roch, F. Mallet, M. H. Devoret and B. Huard (2012), Phys. Rev. Lett. 109, 183901 (open access PDF,supplementary information, Viewpoint in Physics )

Strong measurement and quantum feedback for persistent Rabi oscillations in circuit QED experiments M. Mirrahimi, B. Huard, and M. H. Devoret, Decision and Control (CDC), 2012 IEEE 51st Annual Conference on (open access PDF)


Measurement backaction and feedback in superconducting circuits P. Campagne-Ibarcq, PhD thesis, Ecole Normale Supérieure Paris (2015)

Josephson mixer, swiss army knife for microwave quantum optics E. Flurin, PhD thesis, Ecole Normale Supérieure Paris (2014)

Quantum information with superconducting circuits B. Huard, Habilitation thesis, Ecole Normale Supérieure Paris (2014)


Quantum microwaves Edited by B. Huard, F. Portier and M. Hofheinz (2016), Comptes Rendus Physique 17, 679-804. (Foreword)

Quantum Machines: Measurement and Control of Engineered Quantum Systems Lecture Notes of the Les Houches Summer School: Volume 96, July 2011 Edited by M. Devoret, B. Huard, R. Schoelkopf, and L. F. Cugliandolo (2014), Oxford University Press


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ENS Lyon Site Monod, Building M1, Room 151
46 allée d'Italie, 69364 Lyon cedex 07, France
Phone: (+33) 4 72 72 85 59

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